1211221102212 has 36 divisors (see below), whose sum is σ = 3340033949616. Its totient is φ = 367036697520.

The previous prime is 1211221102211. The next prime is 1211221102213. The reversal of 1211221102212 is 2122011221121.

1211221102212 is a `hidden beast` number, since 1 + 211 + 221 + 10 + 221 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1211221102211) and next prime (1211221102213).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1211221102211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1529319178 + ... + 1529319969.

Almost surely, 2^{1211221102212} is an apocalyptic number.

1211221102212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211221102212 is an abundant number, since it is smaller than the sum of its proper divisors (2128812847404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211221102212 is a wasteful number, since it uses less digits than its factorization.

1211221102212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3058639168 (or 3058639163 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211221102212 its reverse (2122011221121), we get a palindrome (3333232323333).

The spelling of 1211221102212 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred two thousand, two hundred twelve".